Assessment of low back disorders risk based on allowable weight limits for manual lifting in Iran

Afshari, Davood; Latifi, Seyed Mahmoud; Kord, Samira; Nourollahi‐Darabad, Maryam

doi:10.2486/indhealth.2017-0174

Cited by 9 publications

(8 citation statements)

References 34 publications

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“…The weights in the SNOOK tables, which are one of the methods for evaluating manual load lifting, should be revised (27). Afshari et al (28) in 2018, also examined the risk of occupational low back pain was also examined based on the measurable limits of lifting loads in Iran and concluded that the ACGIH TLV method requires further review based on Iranian anthropometric characteristics. Based on the results of the present study, the level of manual lifting risk obtained from WISHA and ACGIH TLV methods is different from each other and makes it difficult to decide on control methods to prevent low back disorders in the study population.…”

Section: Discussionmentioning

confidence: 99%

The Risk Assessment of Low Back Pain Based on Allowable Weight Limits for Manual Lifting in Iranian Women Workers

Afshari

Mojaddam

Nourollahi

2020

Jundishapur J Health Sci

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Background: Manual load lifting is one of the most important risk factors for musculoskeletal disorders, including occupational low back pain. These disorders are common in women workers who perform manual load lifting and displacement tasks at the workplace. Objectives: To determine the level of musculoskeletal disorders and to evaluate the recommended limits of manual load lifting in women workers using WISHA checklist and ACGIH TLV, the recommended limits of Iran, and compare the results of two methods. Methods: This cross-sectional study was conducted on 100 women workers who performed manual loading tasks in 2018. Nordic questionnaire was used to determine the prevalence of musculoskeletal disorders, and two methods, WISHA checklist and ACGIH TLV, were used to determine the recommended allowable limits for manual load lifting. Results: The results of the prevalence assessment of musculoskeletal disorders showed that most of the musculoskeletal disorders were in the low back (55%) in the past 12 months. The results of the assessment of the allowable lifting limits also showed that 8% of women in the WISHA checklist method and 31% in the ACGIH TLV method were at risk for low back injuries. The kappa coefficient test (0.031) also showed that there is a poor and insignificant agreement between the two methods of WISHA checklist and ACGIH TLV in determining the allowable limits for manual lifting. Conclusions: The results of this study showed a poor agreement between the WISHA checklist and ACGIH TLV in determining the allowable limits for manual lifting, which suggest that the two methods are not mutually exclusive. Hence, owing to the increasing presence of women in various occupations and raising the hand load-lifting and, naturally increasing occupational low back pain among them, it is necessary that in a comprehensive study, the allowable limits of lifting loads according to anthropometric and physiological characteristics of Iranian women, prepare and compile according to a comprehensive instruction.

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Section: Discussionmentioning

confidence: 99%

The Risk Assessment of Low Back Pain Based on Allowable Weight Limits for Manual Lifting in Iranian Women Workers

Afshari

Mojaddam

Nourollahi

2020

Jundishapur J Health Sci

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“…Sedangkan analisis beban tulang belakang aktivitas MMH mengangkat galon di replika dengan menggunakan software 3DSSPP trial version yang dikembangkan oleh University of Michigan seperti pada Gambar 3. Berdasarkan Gambar 3 menunjukkan bahwa gaya kompresi pada sendi antara otot lumbal kelima dan sacral pertama (L5/S1) senilai 1644N masih cukup aman dibawah ambang batas 3400N yang disarankan National Institute of Occupational Safety and Health (NIOSH) (Afshari et al, 2018) . Hal ini dapat dipengaruhi oleh pusat gravitasi beban cukup dekat dengan posisi titik joint L5/S1 sehingga lengan momen menjadi kecil yaitu 33,4cm dengan beban 566 N dimana semakin dekat posisi beban maka kecil jarak lengan beban yang berdampak semakin kecil gaya yang dihasilkan.…”

Section: Gambar 1 Postur Aktivitas Mengangkatunclassified

Penilaian Postur Kerja Manual Material Handling (Mmh) Pada Gedung Bertingkat Menggunakan Metode Rapid Upper Limb Assessment (Rula)

Miswari

Aulia

Wahyudi

2021

Sebatik

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Aktivitas penanganan bahan secara manual masih banyak kita temui dalam kehidupan sehari-hari saat melaksanakan sebuah pekerjaan. Ketidak ergonomis pekerjaan manual material handling (MMH) akan menimbulkan risiko keluhan muskuloskeletal disorder (MSDs). Selain dapat menyebabkan risiko-risiko muskuloskeletal, pekerjaan MMH dapat meningkatkan kelelahan otot lokal akibat banyaknya kontraksi otot yang terlibat dan low back pain (LBP). Aktivitas mengangkat dan membawa galon air secara pada gedung bertingkat tentu menjadi tugas yang cukup berat. Penelitian ini dilakukan terhadap aktivitas MMH mengangkat dan membawa air kemasan galon dengan menggunakan metode Rapid Upper Limb Assessment (RULA) untuk menilai postur aktivitas MMH dan mengklasifikasikan dalam tingkatan risiko. Untuk analisis tekanan pada sendi antara lumbal lima dan sacral pertama (L5/S1) dilakukan dengan software prediksi kekuatan dan ketahanan statis tubuh. Hasil yang diperoleh dari penilaian postur dengan metode RULA aktivitas MMH pengangkatan dan membawa galon air mineral secara manual pada gedung bertingkat adalah nilai 7 (tujuh) yang masuk dalam kategori risiko tinggi sehingga perlu adanya perbaikan segera. Hasil analisis gaya tekan L5/S1 pada sikap kerja MMH yaitu sebesar 1644N untuk posisi angkat dan 2475N saat membawa. Usulan perbaikan yaitu posisi tubuh agar tetap tegak, mengurangi sudut yang terbentuk agar memperkecil momen gaya, menggunakan alat bantu material handling lifting secara mekanis maupun elektrik agar pekerjaan MMH tidak menggunakan kekuatan operator yang berlebihan baik saat mengangkat maupun membawa beban.

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“…Manual material handling (MMH) is known as one of the substantial contributors to the risk of low back pain (LBP) and other work‐related musculoskeletal disorders (MSDs) (Afshari et al, 2018; Menzel et al, 2004; Munawir et al, 2020; Rajendran et al, 2021; Zurada, 2012). Occupational jobs demanding frequent and/or heavy load lifting are strongly associated with higher rates of spinal disc degeneration and LBP (Gallagher & Marras, 2012).…”

Section: Introductionmentioning

confidence: 99%

“…To prevent LBP, ergonomic standards are now being used in the workplace to improve the design of workstations with an emphasis on controlling various risk factors contributing to LBP such as lifting, repetitive movements, awkward postures, and forceful exertions (Afshari et al, 2018; Jakobsen et al, 2018; Matsudaira et al, 2014; Muslim & Nussbaum, 2017). A variety of risk assessment methods have been developed based on physiological, biomechanical, and psychophysical criteria, or their combinations to prevent injuries or disabilities.…”

Section: Introductionmentioning

confidence: 99%

Biomechanical and physiological responses to allowable load handling limits in Iranian female workers

Nourollahi‐Darabad,

Mojaddam,

Dianat

et al. 2023

Hum Ftrs & Erg Mfg Svc

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In 2017, load limit values for manual material handling (MMH) tasks were confirmed to protect workers from low back disorders without prior validity investigation for Iranian workers. The present study investigated the applicability and feasibility of the Washington State Department of Labor and Industries (WISHA) lifting method as an occupational exposure limit (OEL) for the MMH tasks in a sample of young Iranian female workers using biomechanical and physiological criteria. A laboratory study was conducted with 10 female participants performing lifting tasks as described in the Iranian OEL for the MMH tasks based on the WISHA checklist. Each participant completed 21 lifting task combinations that varied in height and reach with the maximal allowable load. To test the applicability of the WISHA method, the maximum aerobic capacity and the equivalent heart rate (EHR) were estimated for 10 young Iranian female workers using an ergometer and Astrand protocol. Moreover, spinal loads for each lifting task were calculated using a static biomechanical model. From a physiological point of view, approximately 38% of the lifting tasks resulted in an increase in the physical workload. For 33% of the lifting trials, the estimated compression loads exceeded 3400 N. The findings revealed that the weight and lift height of the loads affected the lifting capacity of the participants. It seems that the allowable weight limits for manual lifting are not matched to the biomechanical and physiological capacities of the Iranian women. Therefore, the Iranian guideline for manual lifting is recommended to be revised based on the physiological and biomechanical capacities of the Iranian women.

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Assessment of low back disorders risk based on allowable weight limits for manual lifting in Iran

Cited by 9 publications

References 34 publications

The Risk Assessment of Low Back Pain Based on Allowable Weight Limits for Manual Lifting in Iranian Women Workers

The Risk Assessment of Low Back Pain Based on Allowable Weight Limits for Manual Lifting in Iranian Women Workers

Penilaian Postur Kerja Manual Material Handling (Mmh) Pada Gedung Bertingkat Menggunakan Metode Rapid Upper Limb Assessment (Rula)

Biomechanical and physiological responses to allowable load handling limits in Iranian female workers

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